Bones Joints and Muscles

Bones, Joints and Muscles Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

The skeleton is a tough, flexible framework for the rest of your body. It also has other functions. It stores such as calcium and phosphorus. It makes red blood cells, platelets, and some blood cells in the bone marrow. It also forms a system of levers with muscles attached. This enables the body to move. It also protects internal .

hold the bones to each other, attach muscle to bone. A muscle pulls one of the bones, which moves the joint. The fluid lubricates and nourishes the tissues in the joint capsule. The synovial lines the joint capsule and secretes synovial fluid. The is a smooth protective surface which protects ther ends of the bones.

Muscles cannot push, the can only pull. The muscles to pull. They only stretch when another muscle pulls. The arm is bent when the muscles contract, and the muscles stretch. When the arm straightens the contract and the muscles stretch.

The upper arm has a bone called the . The lower arm has two bones. The upper bone is called the , and the lower one is called the . The upper bone in the leg is called the , and the lower bones of the leg are called the tibia and .

Weight-bearing activities such as jogging stimulate bone growth. Inactivity can maker bones much less dense and .

Some athletes take muscle building supplements which are banned. Many of the banned substances are . These can have serious health effects on the body, and have an unfair over other athletes in competions.